Video dosyaları üzerinde yüz ifade analizi için hızlandırılmış bir yaklaşım

Yıl 2017, Cilt: 23 Sayı: 5, 602 - 613, 20.10.2017

Sümeyye Bayrakdar , Devrim Akgün , İbrahim Yücedağ

Öz

Yüz
ifadelerinin otomatik olarak analiz edilmesi ve sınıflandırılması;
insan-bilgisayar etkileşimi, bilgisayarlı görme ve görüntü işleme gibi birçok
alanda çalışılan zorlu bir problemdir. Son zamanlarda özellikle
insan-bilgisayar etkileşiminde yaşanan gelişmelerle birlikte, insanlara ait
duyguların bilgisayarlar tarafından anlaşılması elzem bir konu haline
gelmiştir. Bunun yanında psikoloji, güvenlik, sağlık, oyun ve robotik gibi
birçok çalışma alanında da yüz ifadelerinin analizine duyulan ihtiyaç giderek artmaktadır.
Bu nedenlerden dolayı, yüz ifadelerinin hızlı ve doğru bir şekilde analiz
edilmesi farklı uygulama alanlarında birçok yazılım sistemi için kritik bir rol
oynamaktadır. Bu çalışmada, video dosyalarının hızlandırılmış yüz ifade analizi
için bir yaklaşım önerilmiştir. Yüz ifadeleri mutluluk, normal, şaşkınlık ve
üzüntü olmak üzere dört sınıfta ele alınmıştır. Analiz edilen toplam video kare
sayısı azaltılarak ve paralel iş parçacıkları kullanılarak hızlandırılan ifade
analizinin çok-çekirdekli bilgisayar üzerinde başarım değerlendirmesi
sunulmuştur. Deneysel sonuçlar Hyper
Threading teknolojisine sahip dört-çekirdekli işlemci
kullanılarak elde edilmiştir. İşlemci üzerinde 2 iş parçacığı ile yaklaşık 1.8
kat, 4 iş parçacığı ile ise yaklaşık 2.9 kat hızlandırma elde edilirken; 8 iş
parçacığı ile hızlandırma oranı yaklaşık olarak 3.5 kata çıkarılmıştır. Ayrıca
istatiksel analiz sonuçları üzerinde hata analizi yapılarak, hatalı olduğu
tespit edilen görüntü karelerine ait sonuçlar düzeltilmiştir.

Anahtar Kelimeler

Çok-Çekirdekli hızlandırma, Haar özellikleri, Kübik Bézier eğrileri, Paralel hesaplama, Yüz ifade analizi

An accelerated approach for facial expression analysis on video files

Öz

Automatic
analysis and classification of facial expressions is a challenging problem
which takes the attention of researchers studying in many areas such as
human-computer interaction, computer vision and image processing. Currently,
especially due to developments in human-computer interaction, the understanding
of human emotions by computer has become an indispensable issue. Besides,
analysis and recognition of facial expressions has prevailed in various areas
like psychology, security, health, entertainment, and robotics. For these
reasons, the analyzing of facial expressions quickly and correctly play a
critical role for many software systems in different applications. In this
study, an approach is proposed for the accelerated facial expression analysis of
video files. Facial expressions are considered in four class; happy, normal,
confused and sad. By reducing the total number of analyzed video frames and
using parallel threads, performance evaluation of the expression analysis
accelerated on multi-core computer was presented. Experimental results were
obtained using quad-core processor with Hyper Threading technology. According
to experimental results, quad core processor using two threads produced about
1.8 fold speed-up and four threads produced about 3  fold speed-up while eight threads produced
about 3.5 fold speed-up has been obtained. Additionally, the results of image
frames which were found to be incorrect were fixed by performing error analysis
on the results of statistical analysis.

Anahtar Kelimeler

Multi-core acceleration, Haar features, Cubic Bézier curves, Parallel computing, Facial expression analysis

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